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title: 细说websocket - php篇 categories:

• JavaScript
• 前端杂烩
• 网络交互 tags:
• tech
• cnblogs
• PHP
• websocket warning: true date: 2013-12-25 11:24:00 fromUrl: http://www.cnblogs.com/hustskyking/archive/2013/12/25/websocket-with-php.html from: 博客园

+--------+    1.发送Sec-WebSocket-Key        +---------+
|        | --------------------------------> |        |
|        |    2.加密返回Sec-WebSocket-Accept  |        |
| client | <-------------------------------- | server |
|        |    3.本地校验                      |        |
|        | --------------------------------> |        |
+--------+                                   +--------+

GET /chat HTTP/1.1
Host: server.example.com
Origin: http://example.com

GET /chat HTTP/1.1
Host: server.example.com
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==
Origin: http://example.com
Sec-WebSocket-Protocol: chat, superchat
Sec-WebSocket-Version: 13

// 建立一个 socket 套接字
$master = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
socket_set_option($master, SOL_SOCKET, SO_REUSEADDR, 1);
socket_bind($master, $address, $port);
socket_listen($master);

//demo.php
Class WS {
    var $master;  // 连接 server 的 client
    var $sockets = array(); // 不同状态的 socket 管理
    var $handshake = false; // 判断是否握手

    function __construct($address, $port){
        // 建立一个 socket 套接字
        $this->master = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)
            or die("socket_create() failed");
        socket_set_option($this->master, SOL_SOCKET, SO_REUSEADDR, 1)
            or die("socket_option() failed");
        socket_bind($this->master, $address, $port)
            or die("socket_bind() failed");
        socket_listen($this->master, 2)
            or die("socket_listen() failed");

        $this->sockets[] = $this->master;

        // debug
        echo("Master socket  : ".$this->master."\n");

        while(true) {
            //自动选择来消息的 socket 如果是握手 自动选择主机
            $write = NULL;
            $except = NULL;
            socket_select($this->sockets, $write, $except, NULL);

            foreach ($this->sockets as $socket) {
                //连接主机的 client 
                if ($socket == $this->master){
                    $client = socket_accept($this->master);
                    if ($client < 0) {
                        // debug
                        echo "socket_accept() failed";
                        continue;
                    } else {
                        //connect($client);
                        array_push($this->sockets, $client);
                        echo "connect client\n";
                    }
                } else {
                    $bytes = @socket_recv($socket,$buffer,2048,0);
                    if($bytes == 0) return;
                    if (!$this->handshake) {
                        // 如果没有握手，先握手回应
                        //doHandShake($socket, $buffer);
                        echo "shakeHands\n";
                    } else {
                        // 如果已经握手，直接接受数据，并处理
                        $buffer = decode($buffer);
                        //process($socket, $buffer); 
                        echo "send file\n";
                    }
                }
            }
        }
    }
}

demo.php 握手连接测试代码

$ws = new WS('localhost', 4000);

var ws = new WebSocket("ws://localhost:4000");
ws.onopen = function(){
    console.log("握手成功");
};
ws.onerror = function(){
    console.log("error");
};

// 返回帧信息处理
function frame($s) {
    $a = str_split($s, 125);
    if (count($a) == 1) {
        return "\x81" . chr(strlen($a[0])) . $a[0];
    }
    $ns = "";
    foreach ($a as $o) {
        $ns .= "\x81" . chr(strlen($o)) . $o;
    }
    return $ns;
}

// 返回数据
function send($client, $msg){
    $msg = $this->frame($msg);
    socket_write($client, $msg, strlen($msg));
}

var ws = new WebSocket("ws://localhost:4000");
ws.onopen = function(){
    console.log("握手成功");
};
ws.onmessage = function(e){
    console.log("message:" + e.data);
};
ws.onerror = function(){
    console.log("error");
};
ws.send("李靖");

<h3>二、注意问题</h3>

<h4>1. websocket 版本问题</h4>

GET /chat HTTP/1.1
Host: server.example.com
Upgrade: websocket
Connection: Upgrade
Origin: http://example.com
Sec-WebSocket-Protocol: chat, superchat
Sec-WebSocket-Key1: xxxx
Sec-WebSocket-Key2: xxxx

function encry($key1,$key2,$l8b){ //Get the numbers preg_match_all('/([\d]+)/', $key1, $key1_num); preg_match_all('/([\d]+)/', $key2, $key2_num);

    $key1_num = implode($key1_num[0]);
    $key2_num = implode($key2_num[0]);
    //Count spaces
    preg_match_all('/([ ]+)/', $key1, $key1_spc);
    preg_match_all('/([ ]+)/', $key2, $key2_spc);

    if($key1_spc==0|$key2_spc==0){ $this->log("Invalid key");return; }
    //Some math
    $key1_sec = pack("N",$key1_num / $key1_spc);
    $key2_sec = pack("N",$key2_num / $key2_spc);

    return md5($key1_sec.$key2_sec.$l8b,1);
}

//服务器程序
var crypto = require('crypto');
var WS = '258EAFA5-E914-47DA-95CA-C5AB0DC85B11';
require('net').createServer(function(o){
    var key;
    o.on('data',function(e){
        if(!key){
            //握手
            key = e.toString().match(/Sec-WebSocket-Key: (.+)/)[1];
            key = crypto.createHash('sha1').update(key + WS).digest('base64');
            o.write('HTTP/1.1 101 Switching Protocols\r\n');
            o.write('Upgrade: websocket\r\n');
            o.write('Connection: Upgrade\r\n');
            o.write('Sec-WebSocket-Accept: ' + key + '\r\n');
            o.write('\r\n');
        }else{
            console.log(e);
        };
    });
}).listen(8000);

<p>多么简洁，多么方便！有谁还愿意使用 php 呢。。。。</p>

<h4>2. 数据帧解析代码</h4>

<p>本文没有给出 decodeFrame 这样数据帧解析代码，前文中给出了数据帧的格式，解析纯属体力活。</p>

<h4>3. 代码下载</h4>

<p>对这部分感兴趣的同学，可以再去深究。提供了<a href="http://files.cnblogs.com/hustskyking/ws.zip" target="_blank">参考代码下载</a>。</p>

<h4>4. 相关开源库参考</h4>

<p><a href="http://socketo.me" target="_blank">http://socketo.me</a> Ratchet 为 php 封装的一个 WebSockets 库。 ]</p>

<p>Google 上搜索 <a href="//www.google.com.hk/search?q=php+websocket+class" target="_blank">php+websoket+class</a>，也能找到不少相关的资料。</p>

<h3>三、参考资料</h3>